Selectivity in parallel reactions is defined as the ratio of___
(a) Moles of desired product formed to the moles of undesired material formed
(b) Moles of undesired product formed to the moles of desired material formed
(c) Moles of product formed to the moles of reactant consumed
(d) Moles of reactant consumed to the moles of product formed
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My question is from Parallel Reactions Design in division Potpourri of Multiple Reactions, Design for Single & Parallel Reactions of Chemical Reaction Engineering